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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/lib/M7patch.S
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/*

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 * M7patch.S: Patch generic routines with M7 variant.

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 *

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 * Copyright (c) 2016, Oracle and/or its affiliates.  All rights reserved.

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 */

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#include <linux/linkage.h>

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#define BRANCH_ALWAYS	0x10680000

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#define NOP		0x01000000

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#define NG_DO_PATCH(OLD, NEW)	\

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	sethi	%hi(NEW), %g1; \

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	or	%g1, %lo(NEW), %g1; \

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	sethi	%hi(OLD), %g2; \

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	or	%g2, %lo(OLD), %g2; \

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	sub	%g1, %g2, %g1; \

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	sethi	%hi(BRANCH_ALWAYS), %g3; \

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	sll	%g1, 11, %g1; \

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	srl	%g1, 11 + 2, %g1; \

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	or	%g3, %lo(BRANCH_ALWAYS), %g3; \

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	or	%g3, %g1, %g3; \

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	stw	%g3, [%g2]; \

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	sethi	%hi(NOP), %g3; \

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	or	%g3, %lo(NOP), %g3; \

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	stw	%g3, [%g2 + 0x4]; \

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	flush	%g2;

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ENTRY(m7_patch_copyops)

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	NG_DO_PATCH(memcpy, M7memcpy)

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	NG_DO_PATCH(raw_copy_from_user, M7copy_from_user)

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	NG_DO_PATCH(raw_copy_to_user, M7copy_to_user)

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	retl

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	 nop

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ENDPROC(m7_patch_copyops)

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ENTRY(m7_patch_bzero)

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	NG_DO_PATCH(memset, M7memset)

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	NG_DO_PATCH(__bzero, M7bzero)

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	NG_DO_PATCH(__clear_user, NGclear_user)

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	NG_DO_PATCH(tsb_init, NGtsb_init)

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	retl

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	 nop

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ENDPROC(m7_patch_bzero)

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ENTRY(m7_patch_pageops)

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	NG_DO_PATCH(copy_user_page, NG4copy_user_page)

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	NG_DO_PATCH(_clear_page, M7clear_page)

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	NG_DO_PATCH(clear_user_page, M7clear_user_page)

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	retl

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	 nop

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ENDPROC(m7_patch_pageops)

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